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Des Moines police say the ambulance was headed south on East 6th Street when a westbound red pickup truck T-boned the ambulance.

A police report said the ambulance had its emergency lights and sirens on when it ran through a red light. The truck had a green light as it was heading to the on ramp of I-235 when the vehicles collided.

The ambulance rolled onto its side, trapping two people for a while.

The crash sent 66-year-old Stanley Paulson, the driver of the pickup, to Mercy Medical Center. Police confirmed Tuesday that Paulson died from his injuries.

The driver of the ambulance was identified as Scott Rivers, 45, and the second victim was Daniel Butz, 21.

"We offer our deepest condolences to Mr. Paulson's family, friends, and loved ones. They remain in our thoughts and prayers," said Kim Chapman, president and CEO of Midwest Ambulance.

Police said the crash is still under investigation and no charges have been filed.